Controllable synthesis of nano-sized LiFePO4/C via a high shear mixer facilitated hydrothermal method for high rate Li-ion batteries

被引：64

作者：

Liu, Yuanyuan ^{[1
]}

Gu, Junjie ^{[1
,2
]}

Zhang, Jinli ^{[1
]}

Wang, Jiao ^{[1
]}

Nie, Ning ^{[1
]}

Fu, Yan ^{[1
]}

Li, Wei ^{[1
]}

Yu, Feng ^{[3
]}

机构：

[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Carleton Univ, Dept Mech & Aerosp Engn, Ottawa, ON K1S 5B6, Canada

[3] Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2015年 / 173卷

关键词：

Lithium iron phosphate; Hydrothermal crystallization; Precursor precipitate; Nano-sized particle; High shear mixer; LITHIUM IRON PHOSPHATE; HIGH-RATE CAPABILITY; ELECTROCHEMICAL PERFORMANCE; CATHODE MATERIALS; PARTICLE-SIZE; MORPHOLOGY; NANOPARTICLES; CO; TRANSFORMATION; MICROSPHERES;

D O I：

10.1016/j.electacta.2015.05.103

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Decreasing particle size ensures a good accessibility for LiFePO4 to reach theoretical capacity and achieve high cycling rates owing to the improved Li-ion diffusion coefficient. In this paper, the size of LiFePO4 particle is successfully controlled hydrothermally through adjusting the size and morphology of its precursor precipitate via high shear mixer (HSM) without involving any environmentally toxic surfactants. It is indicated that the LiFePO4/C particles synthesized by HSM at the stirring rate of 1.3 x 10(4) rpm exhibit a reduced particle size of similar to 220 nm and an enlarged surface area of 15.6 m(2).g(-1), which perform a high Li-ions diffusion coefficient of 1.43 x 10(-13) cm(2).s(-1). The LiFePO4/C nanoparticles exhibit large discharge capacity of 160.1 mAh.g(-1) at 0.1 C and even high rate capacity of 90.8 mAh.g(-1) at 20 C. This work suggests that adjusting the size and morphology of the precursor precipitates is an effective way to quicken the nucleation and crystal growth, so that to obtain fine particles with high specific surface area and high crystalline purity. (C) 2015 Published by Elsevier Ltd.

引用

页码：448 / 457

页数：10

共 52 条

[21] Citric Acid- and Ammonium-Mediated Morphological Transformations of Olivine LiFePO4 Particles [J].